greenleaf



NITED STATES PATENT OFFICE.

M. T. GREENLEAF, OF QUINCY, ILLINOIS.

PUMP.

Specification of Letters Patent No. 32,831, dated July 16, 1861.

To all whom it may concern:

Be it known that I, M. T. GREENLEAF, of Quincy, in the county of Adamsand State of Illinois, have invented a new and Improved Pump; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexed drawing,making a part of this specification.

The drawing represents a verticall central section of my invention.

This invention consists in the employment or use of a hollow piston rodin connection with two pistons, air and water chambers, a receivingvalve and check valve; all arranged substantially as hereinafterdescribed, whereby a simple and efficient suction and force pump isobtained.

To enable those skilled in the art to fully understand and construct myinvention I will proceed to describe it.

A represents the pump cylinder, the lower part a, of which is ratherlarger in diameter than the upper part Z); and B is the piston orplunger rod which is hollow, and has a ball check valve c, in its lowerend. To the lower end of rod B, the piston B', is attached, said piston.working in the larger part a., of the cylinder. The piston B, isprovided with a receiving valve CZ, which opens upward of course, aswill be seen by referring to the drawing.

To the lowei` part of the cylinder A, the induction or suction pipe D isattached, in the upper part of which a check valve E, is placed. 'At thelower part of the upper chamber Z), of the cylinder there is placed acheck valve F, and an inverted tube G, is attached to the rod B, saidtube working in the chamber Z), similar to a piston. The rod B, abovethe check valve F, has openings e, made in it, the use of which will bepresently explained.

The operation is as follows When the rod B, is elevated the lower parta, of the cylinder A, below the piston B, fills with watersee arrowsl-while the portion of part a, above the piston which was previouslyfilled by the descent of the piston is forced up through check valve F,within tube G, and through the holes c, up through the hollow rod B,-seearrows 2. Then the rod B, is forced down, the water in a, below thepiston B, passes up through valve CZ, into the upper part of a, whilethe water in the tube Gr, which was filled by the previous ascent of theplunger B, is forced through the openings e, up through the rod asindicated by the arrows 3; thus a continuous stream is forced up throughrod B, and a suction and force pump combined.

In case only a force pump is required t-he suction pipe D, and checkvalve E, may be detached, and the pump placed at the bottom of the well,and just previous to the termination of the descent of the plunger B',the check valve c, may come in contact with a pin or projection whichwill raise it and allow the water to escape from within the rod B, andconsequently the freezing up of the rod will be prevented.

The interior of the tube G, it will be seen serves as an air as well aswater chamber.

The arrangement of parts is extremely simple and efficient.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The cylinder A, formed of two parts a, l), of different diameter incombination with the piston B, tubular piston G, check valves F, c, andreceiving valve (Z, with or without the check valve E, and suction pipeD, for the purpose specied.

M. T. GREENLEAF. 'Witnesses ALEX. Gr. ANDERSON,

JOHN HAMILTON. 'i

